Question

Помогите решить.
1) x-4/x-2 - x/2-x
2) 3x/4x-4 + 5x/7-7x

Answer 1

Ответ:

Объяснение:

$\frac{x-4}{x-2}-\frac{x}{2-x}= \frac{x-4}{x-2}+\frac{x}{x-2} = \frac{x-4+x}{x-2} =\frac{2x-4}{x-2} = \frac{2(x-2)}{x-2}=2\\\frac{3x}{4x-4}+\frac{5x}{7-7x}=\frac{3x}{4(x-1)}-\frac{5x}{7(x-1)}=\frac{21x}{28(x-1)}-\frac{20x}{28(x-1)}=\frac{x}{28(x-1)}$